我的css過渡不起作用

Question

我有一個帶有ap標簽的li，它只會在你懸停li時顯示，但我無法在它之間進行轉換，我該怎么做？ 也許只有javascript可能是jQuery，我不知道如何解決這個問題

<ul class="promo-line two">
    <li>
        <p>36%</p>
    </li>
    <li>
        <p>45%</p>
    </li>
    <li>
        <p>50%</p>
    </li>
</ul>

和：

* {margin:0;padding:0;}

.promo-line.two li:nth-child(1) {
    background: red;
}

.promo-line.two li:nth-child(2) {
    background: blue;
}

.promo-line.two li:nth-child(3) {
    background: yellow;
}

.promo-line li p {
    display: none;
    transition: all 1s ease-in-out;
}

.promo-line li:hover > p {
    display: block;
    background: rgba(0,0,0,0.5);
    color: white;
    width: 314px;
    height: 180px;
    line-height: 180px;
    text-align: center;
    font-size: 25px;
    box-shadow: inset 5px 5px 40px black;
}

.promo-line li {
    position: relative;
    width: 314px;
    height: 180px;
    margin: 0 0 0 4px;
    float: left;
    background: purple;
}

Answer 1

見http://jsfiddle.net/GB4QL/2/

您需要使用opacity屬性而不是display

  * {margin:0;padding:0;}

.promo-line.two li:nth-child(1) {
    background: red;
}

.promo-line.two li:nth-child(2) {
    background: blue;
}

.promo-line.two li:nth-child(3) {
    background: yellow;
}

.promo-line li p {
    opacity: 0;
    background: rgba(0,0,0,0.5);
    color: white;
    width: 314px;
    height: 180px;
    min-height:180px;
    line-height: 180px;
    text-align: center;
    font-size: 25px;
    box-shadow: inset 5px 5px 40px black;
    transition: all 1s ease-in-out;
}

.promo-line li:hover > p {
    opacity: 1;

}

.promo-line li {
    position: relative;
    width: 314px;
    height: 180px;
    margin: 0 0 0 4px;
    float: left;
    background: purple;
}